Malicious PDF — malware analysis report

Static analysis result for SHA-256 238a1d7f5f20f5a3…

MALICIOUS

PDF

75.0 KB Created: 2021-02-21 02:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0a164297e71d4f83f5a3a9381635b8fd SHA-1: 5931caa52dae83c051495b41054783bd1aaeb568 SHA-256: 238a1d7f5f20f5a3332be5e17ade558957444293399837bfe90a667714d9d231
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL and the document's text suggest a lure for a 'hack' or cheat, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=boom+beach+hack+no+human+verification+or+survey PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5ff1ce61303c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fe8ee91abf76.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/bujdA6Y/azarenka_us_open_2020_ranking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd5f0f7cf5e9.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/2128904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_6027c205d30a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_603142b6e517a.pdfIn PDF document text
    • http://haustova.com/accueillir_la_petite_enfance_formationbpdsw.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/sibapasovonoduxugk97h.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/cI2gfiV/batman_knightfall_suit_arkham_knight.pdfIn PDF document text
    • http://reduslimitaly.website/mezed5ytrx.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/tjDotjh/xbox_game_pass_beta_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/q7tbAje/brain_games_for_dogs_pets_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_602ed57e15bc3.pdfIn PDF document text
    • http://hookup153.fun/korean_language_basic_words_with_english_translation6n4by.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 5504 bytes
SHA-256: 7985d0400604bfb99ab8e2d091d28ffea6356c257139e8d51fc577760ad7aac9
font_01_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 10444 bytes
SHA-256: 5968763e9136c421938e39dbb32eef27956af2a5ce7be16bceb5861ffbf13c98

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